Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e5a889d4c08af0…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 19:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3fbd92d937a5a2f40763fcc60c29cbc SHA-1: 35db4dfc05b17639a80ace0ab18b0654f4ca4a68 SHA-256: 27e5a889d4c08af0068162c1c9bfb7421bbfb982bd008192b3c3f6fcc3897956
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=cricket+game+offline PDF link annotation
    • http://alrabbancapital.com/file/files/doferu.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/lavetakumusip.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/83006374889.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/xuponem.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/kijibedibosezojataxi.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/14230808447.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/68781405940.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/pixowibabazex.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/tiveninogawilos.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb155e2f12---33837826988.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/raxefidebelolugosop.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/jitutidivibufakaxetud.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb0919729---vusumajexuzararumuxava.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/32991552346.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/7780543701.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161345106138aa---mebanafibasewurefalex.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/93679561377.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/86418016834.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210916_141208.pdfIn PDF document text
    • http://bamila.vn/luutru/files/vapos.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/gogin.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/36203410224.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/97910134704.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 17200 bytes
SHA-256: abe9d164182b11f5c571f28650ac061f10d5231f240027604b58c38a5a0ce560
font_01_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13676 10636 bytes
SHA-256: 79b25393d004dbe6af2dce671894c282ffe46547a51ce7822a302679b376d5df

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